However, the marriage was called into question because of the close blood-kinship of the pair. When on 7 September 878 the pope crowned Louis (who had succeeded his father in the previous year), the pope refused to crown Adelaide.[2]

When Louis the Stammerer died in Compiegne on 10 April 879, Adelaide was pregnant, giving birth on 17 September 879, to Charles the Simple.[3] The birth of this child led to a dispute between Adelaide and Ansgarde. Ansgarde and her sons accused Adelaide of adultery; Adelaide in turn disputed the right of Ansgarde's sons to inherit. Eventually, Adelaide succeeded in winning the case; but despite this, Ansgarde's sons Louis and Carloman remained kings until their deaths without heirs in 882 and 884, respectively, with the crown then being contested between Odo, Count of Paris and Charles the Fat.

Charles eventually succeeded to his father's throne in 898; his mother assisted in crowning him. She died in Laon on 10 November 901 and was buried in the Abbey of Saint-Corneille, Compiègne, Picardy.